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Bullseye 000403 Opaline Opalescent is one of those glasses that can be a little confusing the first time you use it. In its cold, unfired form, it can look quite clear, sometimes with only a few white wisps. After firing, though, it can develop into a soft, hazy, milky glass that lets light through in a warm way.

This article is only about using Bullseye 000403 Opaline Opalescent in glass fusing. It is written for beginner and hobby glass fusers who want to know what this glass does, when to use it, and what to watch for before putting it into an important piece. 

Glass compatibility sounds like one of those topics that should be simple, but it can become confusing very quickly.

This article is not meant to be a technical chemistry lesson. It is a practical way to think about compatibility in an ordinary glass-fusing workspace, so you can avoid one of the more frustrating causes of cracks and failures.

Most of us start with firing schedules the same way.

We find one somewhere, copy it into the kiln controller, press start, and hope for the best.

And honestly, that is not a terrible place to begin. We all have to start somewhere. But after you have fired a few pieces, you quickly find out that a firing schedule is not magic. It is not a recipe that works the same in every kiln, with every piece of glass, every time.